Shoe for aeroplane brakes



och 6, 1931. I CAUTLEY 1,825,653

SHOE FOR AERCSPLANE BRAKES Filed March 15, 1928 2 Sheets-Sheet l 1 ATTORNEY Get, 6 193%. T E 1,825,553

SHOE FOR AEROPLANE BRAKES File d March 15,1928 2 Sheets-Sheet 2 iNVENTOR Patented Get. a 33?.

STATES PATENT FFHC JOHN R. CAUTLEY, OF SOUTH BEND, INDIANA, ASSIGNOR TO BENDIX BRAKE COLL PANY, OF SOUTH BEND, INDIANA, A CORPORATION OF ILLINOIS SHOE FOR AEROPLANE BRAKES Application filed March 15, 1928. Serial No. 261,727.

This invention relates to brake shoes, and is illustrated as embodied in an internal expanding aeroplane brake. An object of the invention is to provide a shoe structure that can be built up of pressed sheet duralumin, having in mind that this material can be bent or displaced readily, but cannot be drawn very deeply and cannot be welded. Preferably the shoe has a body portion consisting of two channel-section elements, involving in their manufacture comparatively little drawing of the sheet material, and which are riveted or otherwise fastened back to back.

Various features of novelty relate to the mounting of improved fittings on the ends of these shoes, and to the shoe structure and to the arrangement of the shoes in the brake, and to various other novel combinations of parts and desirable structural details which will be apparent from the following description of the illustrative embodiment shown in the accompanying drawings, in which:

Figure 1 is a vertical section through the brake, just inside the head of the brake drum, and showing the brake shoes in side elevation;

Figure 2 is a partial elevation from the backing plate side of the brake, showing the operating mechanism;

Figure 3 is a diametrical section through the brake on the line 8.3 of Figure 1; and

Figures 4 and 5 are partial arcuate sections through the brake on the lines 44 and 55 of Figure 1.

The illustrated brake includes an aluminum drum 10 integral with the hub 12 of a wheel 14 for an aeroplane. A suitable support such as a cast aluminum backing plate 16 is arranged at the open side ofthe drum. The drum may be reinforced by ribs 18. The friction means of the brake includes two novel shoes 20 and 22 arranged end to end within the drum amlexpanded against the drum in applying the brake by a cam 24 having a shaft 26 journaled in a support 28 carried by the backing plate, and which shaft has secured at its end an operating arm 30.

Arm 30 is shown with a number of holes 32, to permit variation in the effective leverage. Support 28 is secured to the backing plate partly by a bolt 34, and partly by an anchor 36 on which shoe 20 is pivoted. Shoes 20 and 22 are pivotally connected by a floating pivot 38, grooved at one end to interlock with a flange on the end of an adjustable eccentric stop 40. Cam 24 acts to apply shoe 22, against the resistance of a return spring 42 tensioned between the shoes, whereupon shoe 22 turns with the drum and applies shoe 20 against the resistance of an auxiliary return spring 44. l

As shown in Figures 35, each shoe body is built up by riveting together,back to back, two channel-section pressed duralumin elements, and securing by riveting or otherwise in the channels on opposite sides of the shoe, at both ends of the shoe, separatelyformed duralumin plates 46. At this stage of their manufacture, the shoes 20 and 22 are interchangeable. The plates 46 are preferably substantially flush with the flanges of the channels on the sides of the shoes.

At the anchored end of shoe 20, the anchor pivot 36 directly engages registering openings in plates 46 and in the two shoe-body elements, the pivot having a collar 50 engaging one side of the shoe, and a washer 52 held by a cotter pin 54 engaging the other side of the shoe. At its other end the shoe 20-has two separately-formed connecting plates 56 secured rigidly thereto by rivets 58 and 59, and which project beyond the end of shoe 20. Plates 56 straddle the end of shoe 22, and are connected thereto by the pivot 38. The cam end of shoe 22 has rollers 60 engagingribs 62 on the cam 24, and which are mounted on a pivot pin 64 passing through the shoebody elements and through plates 46 and having retaining washers 66 and 68 held by cotter pins 70. Washer 68 engages the side of cam '24 to hold theshoe laterally.

rately-formed plates secured within and flush with the edges of said channels on opposite sides of the shoe, and parts on opposite sides of the shoe separated by said elements and said plates sufiiciently to clear the shoe end.

2. A brake comprising, in combination, a. shoe having a body portion comprising two clninnel-section elements secured back to back and separately-formed plates secured within said channels on opposite sides of the shoe, connecting plates on opposite sides of the shoe separated by said elements and said plates sufficiently to clear the shoe end, and another shoe having its end projecting between and pivotally connected to said connecting plates.

3. A brake comprising. in combination, a pair of shoes parts and arranged end to end and one of hich has a pair of separately-formed connecting plates rigidly secured to its opposite sides and straddling the end of the other shoe, and means pivotally connecting the straddled end of said other shoe to said plates.

In testimony whereof, I have hereunto signed my name.

JOHN R. (.AUTLEY.

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